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20th September 2018, 08:24 PM #1
Bench grinder tapered spindle off centre
I've had a small bench grinder for years, with a tapered spindle on one end for buffing wheels, and the spindle has always been a little off centre, with about 2mm of movement at the end of the spindle when rotating. When it's going, it vibrates the bench that it's attached to, makes lots of noise, and everything on the bench moves around, and often falls off. At times, the buffing wheel has worn itself to match the spindle, and this has reduced the vibration, but any catch of the wheel will spin it to a new position on the spindle, and then it's worse than ever.
I've always put it down to being a cheap grinder and assumed perhaps the thread was off on the grinder shaft, but I recently got a 1HP Jet grinder (second hand), and mounted a spindle on that, and it's worse!
The new spindles are Josco ones from Bunnings - they come in a two pack, supposedly 5/8" and 16mm. They both fit on the grinder, and they are both off-centre.
Is there a trick to mounting the spindles, or some way to get them properly centred? Do I need to buy more expensive spindles?Good things come to those who wait, and sail right past those who don't reach out and grab them.
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20th September 2018, 11:29 PM #2China
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No there is no trick they should be right , you could re machine however it would not be cost effective or practical, maybe contact Josco and see if they will replace itI have always used this brand and have no problems Taper Spindles For Bench Grinders - 140mm Overall - Products - Precision Specialty Tooling
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21st September 2018, 09:47 AM #3.
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I have a 16 mm Josco tapered spindle and it is fine.
RE: "They both fit on the grinder"
That is not right - only one should fit fully onto the grinder.
If the grinder spindle thread is 16 mm and a 5/8 has been jammed onto it then this may have damaged the thread.
The same for the 16mm on a 5/8.
If they both fully fit then the thread on the grinder spindle has been cut undersize which would explain the problem.
I would check this out before buying more spindles
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21st September 2018, 10:16 AM #4
Thanks for that. I've done some more measurements, and the two spindles I have are off-centre in different directions, so it's definitely the spindles. I'll be taking them back and try to get some decent ones elsewhere.
Good things come to those who wait, and sail right past those who don't reach out and grab them.
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21st September 2018, 10:25 AM #5
Hmm, interesting. How can I check this out? The thread doesn't look damaged at all. I've measured the OD of the thread, and it's 15.2mm (15.3mm on the other end). It is quoted as a 5/8" thread (Jet is an american brand), and 16mm is larger than 5/8". Both spindles are quite wobbly until the last moment of tightening where is seats into position, but that is similar to my other grinder in that respect. I also tried thread-taping around the thread and on the shaft as well, so that everything was tight, but it made no difference.
Good things come to those who wait, and sail right past those who don't reach out and grab them.
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21st September 2018, 10:38 AM #6.
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21st September 2018, 01:36 PM #7
The jet spindle is quoted as 5/8, and is 11TPI, so matches UNC thread. The thread does have a flat top, and looks to have been machined that way, so this might explain the slightly small OD measurement. Hare and Forbes carry the Precision Tooling spindles, so I will bring my grinder in and check the fit before I buy them.
Thanks for your help!Good things come to those who wait, and sail right past those who don't reach out and grab them.
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26th September 2018, 10:11 AM #8
Solved! I got one of the precision tooling spindles from Hare and Forbes, and it's great. Put it on, and it went straight on, perfectly centred. Thanks for the recommendation.
Good things come to those who wait, and sail right past those who don't reach out and grab them.
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